chr7-141919795-G-T

Position:

• chr7-141919795-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001001656.3(OR9A4):​c.920G>T​(p.Arg307Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: OR9A4 NM_001001656.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.796

Genes affected

OR9A4 (HGNC:15095): (olfactory receptor family 9 subfamily A member 4) Olfactory receptors interact with odorant molecules in the nose, to initiate a neuronal response that triggers the perception of a smell. The olfactory receptor proteins are members of a large family of G-protein-coupled receptors (GPCR) arising from single coding-exon genes. Olfactory receptors share a 7-transmembrane domain structure with many neurotransmitter and hormone receptors and are responsible for the recognition and G protein-mediated transduction of odorant signals. The olfactory receptor gene family is the largest in the genome. The nomenclature assigned to the olfactory receptor genes and proteins for this organism is independent of other organisms. [provided by RefSeq, Jul 2008]

MGAM (HGNC:7043): (maltase-glucoamylase) This gene encodes maltase-glucoamylase, which is a brush border membrane enzyme that plays a role in the final steps of digestion of starch. The protein has two catalytic sites identical to those of sucrase-isomaltase, but the proteins are only 59% homologous. Both are members of glycosyl hydrolase family 31, which has a variety of substrate specificities. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08690971).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OR9A4	NM_001001656.3	c.920G>T	p.Arg307Leu	missense_variant	2/2	ENST00000641559.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OR9A4	ENST00000641559.1	c.920G>T	p.Arg307Leu	missense_variant	2/2		NM_001001656.3	P1
OR9A4	ENST00000548136.1	c.920G>T	p.Arg307Leu	missense_variant	1/1			P1
MGAM	ENST00000465654.5	c.-180+11927G>T		intron_variant		3
MGAM	ENST00000497554.1	n.37-9982G>T		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 02, 2021

The c.920G>T (p.R307L) alteration is located in exon 1 (coding exon 1) of the OR9A4 gene. This alteration results from a G to T substitution at nucleotide position 920, causing the arginine (R) at amino acid position 307 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.60
CADD	Benign	3.5
DANN	Uncertain	0.98
DEOGEN2	Benign	0.072	T;T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.032	N
LIST_S2	Benign	0.58	.;T
M_CAP	Benign	0.0054	T
MetaRNN	Benign	0.087	T;T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	1.7	L;L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.20	T
PROVEAN	Uncertain	-2.7	.;D
REVEL	Benign	0.028
Sift	Uncertain	0.0060	.;D
Sift4G	Uncertain	0.0070	.;D
Polyphen		0.034	B;B
Vest4		0.25
MutPred		0.46		Loss of MoRF binding (P = 0.0287);Loss of MoRF binding (P = 0.0287);
MVP		0.34
MPC		0.054
ClinPred		0.18	T
GERP RS		-2.1
Varity_R		0.051
gMVP		0.19

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr7-141619595; COSMIC: COSV71885465;